20533145233 has 4 divisors (see below), whose sum is σ = 20763854820. Its totient is φ = 20302435648.

The previous prime is 20533145231. The next prime is 20533145267. The reversal of 20533145233 is 33254133502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33254133502 = 2 ⋅16627066751.

It can be written as a sum of positive squares in 2 ways, for example, as 4222790289 + 16310354944 = 64983^2 + 127712^2 .

It is a cyclic number.

It is not a de Polignac number, because 20533145233 - 2¹ = 20533145231 is a prime.

It is a super-2 number, since 2×20533145233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20533145195 and 20533145204.

It is not an unprimeable number, because it can be changed into a prime (20533145231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115354660 + ... + 115354837.

It is an arithmetic number, because the mean of its divisors is an integer number (5190963705).

Almost surely, 2^20533145233 is an apocalyptic number.

It is an amenable number.

20533145233 is a deficient number, since it is larger than the sum of its proper divisors (230709587).

20533145233 is an equidigital number, since it uses as much as digits as its factorization.

20533145233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230709586.

The product of its (nonzero) digits is 32400, while the sum is 31.

Adding to 20533145233 its reverse (33254133502), we get a palindrome (53787278735).

The spelling of 20533145233 in words is "twenty billion, five hundred thirty-three million, one hundred forty-five thousand, two hundred thirty-three".